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Belt driving apparatus and image forming apparatus

Active Publication Date: 2014-02-27
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a smaller belt driving unit and an image forming apparatus that can keep the belt properly positioned. The belt driving unit includes a rotatable belt, stretching rollers, and a supporting portion that allows the belt to move. When the belt shifts in the longitudinal direction, the rotatable portion tilts the stretching roller about the supporting portion. The technical effect of this invention is to improve the precision and stability of the belt driving unit.

Problems solved by technology

A belt driving unit such as the one described above is problematic in that as the belt is circularly driven, it tends to shift in the widthwise direction of the belt (direction roughly perpendicular to moving direction of belt).

Method used

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  • Belt driving apparatus and image forming apparatus
  • Belt driving apparatus and image forming apparatus
  • Belt driving apparatus and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0029]

[0030]FIG. 1 is a schematic sectional view of a typical color image forming apparatus equipped with a belt driving unit, as an intermediary transfer unit, in accordance with the present invention, and shows the general structure of the apparatus. To begin with, the structure of the image forming apparatus 100 in this embodiment is described referring to FIG. 1. The image forming apparatus 100 can electrophotographically form an image on a sheet P of recording medium such as ordinary recording paper, OHP film, etc., in response to electrical signals sent from an external devices such as a personal computer connected to the image forming apparatus 100 in such a manner that information can be exchanged between the image forming apparatus and external devices.

[0031]The image forming apparatus 100 has multiple (four in this embodiment) image formation units 110Y, 110M, 110C and 110K, which form yellow, magenta, cyan and black monochromatic toner images, respectively. The image form...

embodiment 2

[0078]Next, referring to FIGS. 13 and 14, the invention is described with reference to another belt driving unit in accordance with the present invention, and an image forming apparatus equipped with this belt driving unit. In the following description of the second embodiment, the components, portions, etc., of the belt driving unit and image forming apparatus, which are the same in structure as the counterparts in the first embodiment are given the same referential codes as those given to the counterparts, and are not going to be described here. In the first embodiment, both the widthwise edge portions of the belt 1 were provided with ribs 12a and 12b, one for one. Further, both the lengthwise end portions of the tension roller 4 were provided with rollers 16a and 16b, one for one, having the rib contacting portion 16e, which corresponds to the ribs 12a or 12b, respectively.

[0079]In this embodiment, the belt driving unit is structured so that the belt 1 is made to tend to laterall...

embodiment 3

[0087]Next, referring to FIG. 15, the third embodiment of the present invention is described with reference to another belt driving unit in accordance with the present invention, and an image forming apparatus equipped with the belt driving unit. The components, portions, etc., of the belt driving unit and image forming apparatus, which are similar in structure as the counterparts in the first embodiment are given the same referential codes as those given to the counterparts, and are not going to be described here. In the first embodiment, the belt 1 was provided with the ribs 12a and 12b, which were attached next to the edges of the belt 1, one for one, and the lengthwise ends of tension roller 4 was provided with the rollers 16a and 16b, one for one, having the rib contacting portion 16e which corresponds in position to the rib 12a or 12b, respectively.

[0088]Further, the belt driving portion 200 was structured so that as the belt 1 shifts in its widthwise direction, only the rib 1...

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PUM

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Abstract

A belt feeding unit includes a rotatable belt; a first stretching roller; a second stretching roller including a stretching portion; a supporting portion for supporting the stretching portion while permitting movement of opposite end portions thereof up and down; a rotatable portion coaxial with the second stretching roller; wherein when the belt shifts in the longitudinal direction, the belt contacts the rotatable portion to rotate the rotatable portion, thus tilting the second stretching roller about the supporting portion relative to a rotational axis of the first stretching roller.

Description

TECHNICAL FIELD[0001]The present invention relates to a belt driving unit which circularly moves an endless belt while suspending the belt with multiple belt suspending members. It relates also to an image forming apparatus such as an electrophotographic print, an electrophotographic copy machine, and the like, which is equipped with a belt driving unit in accordance with the present invention.BACKGROUND ART[0002]Some electrophotographic image forming apparatuses, for example, electrophotographic printers, electrophotographic copy machines, and the like are equipped with a belt driving unit which circularly moves an endless belt while suspending the belt with multiple belt suspending rollers. A belt driving unit such as the one described above is problematic in that as the belt is circularly driven, it tends to shift in the widthwise direction of the belt (direction roughly perpendicular to moving direction of belt).[0003]There are various methods for controlling this lateral moveme...

Claims

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Application Information

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IPC IPC(8): B65G15/64
CPCB65G15/64G03G15/1615G03G15/755G03G2215/00151B65G23/44
Inventor OGATA, ATSUSHI
Owner CANON KK
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